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the subjects which have given rise to differences of opinion among political economists, the definition of wealth is not the least remarkable. Such differences could hardly have taken place, if the definition had been obvious and easy; but in reality, the more the subject is considered, the more it will appear difficult, if not impossible to fix on one not liable to some objection. In a work, however, on a science, the great object of which is, to inquire into the causes which influence the progress of wealth, it must be of use to describe as distinctly as the nature of the subject will admit, what is meant by that wealth the increase or decrease of which we are about to estimate: and if we cannot arrive at perfect accuracy, so as to embrace all we wish, and to exclude all we wish in some short definition, it seems desirable to approach as near to it as we can. It is known not to be very easy to draw a distinct line between the animal, vegetable, and mineral kingdoms; yet the advantages of such a classification are universally acknowledged; and no one on account of a difficulty, in a few cases of little importance would refuse to make use of so convenient an arrangement.

It has sometimes been said, that every writer is at liberty to define his terms as he pleases, provided he